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Chetek Lakes Diagnostic and Feasibility Study Barr Engineering Company August 2, 2009 Annual Meeting
Overview Lake Water Quality Basics Why Study? Study Details CLPA Volunteers Needed
How Does Phosphorus Affect WQ? Increase in Phosphorus Increase in Algae Lake gets Greener Secchi Disc reading Decreases
Phosphorus Sources Watershed Sediment Rainfall Groundwater
How Do Sediments Add Phosphorus to Lakes? Really low oxygen at bottom Phosphorus released from sediments Phosphorus mixed throughout lake from BoatsWind Fall Temperature Change
Watershed Phosphorus Loading Rain Runoff Phosphorus to Lake
Why Study? Secchi Disc readings Decreased Since 1996 – Why? Lake Sediment Study Needed Lake on 303d list of impaired waters
Study Details Phase 1 Habitat Study Monitoring Phase 2 Internal Load Study Modeling Management Plan
DNR Habitat Maps Aquatic Plant Sensitive Areas Coarse Rock Rubble Habitat Areas for Walleyes Coarse woody debris habitat Shoreline buffers/restoration areas
Sediment Monitoring - Barr Mud - 7 cores Prairie – 18 cores Pokegama – 7 cores Chetek – 8 cores Ten Mile – 6 cores Total of 46 cores
Sediment Monitoring - Barr Discover exactly how much phosphorus is in the lake sediments by measuring it
Tributary Monitoring - USGS Flow – 2 years Phosphorus – 1 year
Lake Monitoring 7 Times Per Year – USGS Volunteers – Weekly – June- Sept. Chetek – 2 years Other Lakes – 1 year
Other Monitoring - USGS Recording Stage Gage Recording Precipitation Gages 10 Groundwater Piezometers
Phase 2 – Internal Phosphorus Load Study Phosphorus release rates – low oxygen or high pH Boat propellor resuspension
Modeling Components How much Water enters the lake? How much Phosphorus enters the lake? Where does the Phosphorus come from? How much can Water Quality improve?
Management Plan Set Goals Watershed Management Internal Load Management Habitat Management Committee & Public Meetings CLPA Approval, WDNR Approval
What comes next? Projects from the management plan Projects that improve water quality
Schedule Phase to 2013 Phase to 2013
Study Cost About $290,000 for Phase 1 Estimate Similar Cost for Phase 2 About $580,000 for Study About $116,000 per lake
Funding Sources Two DNR Lake Protection Grants of $200,000 Each USGS Funds 35% of USGS Project CLPA $10,000 for Each Phase
CLPA Cost About $10,000 for Phase 1 About $10,000 for Phase 2
Volunteers Needed Lake Sampling Stream Sampling Sediment Sampling
Support Contact CLPA President John Plaza Support? Feedback?
Next Steps Meet With DNR Apply for Lake Protection Grant Funds Find Volunteers
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